Once in a while, a man’s smoking, drinking and staying up late usually have no effect on pregnancy preparation. However, smoking, drinking and staying up late for a long time will have some effect on pregnancy. Nicotine in cigarettes will affect the health of the body, long-term smoking may also lead to a decline in the quality of sperm, resulting in sperm can not develop mature or weak sperm phenomenon during the preparation for pregnancy, thus reducing the chances of pregnancy. Long-term drinking may also jeopardize the nervous system, liver, etc., so that the sexual function of the male significantly reduced, affecting the quality of the sperm, so that the sperm mobility decreased, deformity rate increased, thus affecting the pregnancy, even if the pregnancy, the fetus may have developmental deformity phenomenon. Long-term staying up late may cause the body’s immunity to decline when the fine disease virus invasion, may also have an impact on the quality of sperm, thus affecting the pregnancy. In summary, long-term smoking, drinking, staying up late on the preparation for pregnancy is a big impact, it is recommended to prepare for the pregnancy of the boys should do to develop good habits, increase the amount of aerobic exercise, pay more attention to the balanced intake of nutrients, pay attention to do not stay up all night, quit smoking in advance, stop drinking, to improve the success rate of conception.